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Of the following, which is least?

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Of the following, which is least?  [#permalink]

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New post 11 Dec 2017, 22:43
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A
B
C
D
E

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  35% (medium)

Question Stats:

61% (00:39) correct 39% (00:41) wrong based on 115 sessions

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Of the following, which is least?

A. \(\frac{-0.7}{0.000012}\)

B. \(\frac{0.7}{-0.00012}\)

C. \(-\frac{0.7}{0.0012}\)

D. \((\frac{0.012}{-0.7})^{(-1)}\)

E. \(-\frac{0.7}{0.12}\)

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Of the following, which is least?  [#permalink]

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New post 11 Dec 2017, 23:23
Bunuel wrote:
Of the following, which is least?

A. \(\frac{-0.7}{0.000012}\)

B. \(\frac{0.7}{-0.00012}\)

C. \(-\frac{0.7}{0.0012}\)

D. \((\frac{0.012}{-0.7})^{(-1)}\)

E. \(-\frac{0.7}{0.12}\)



A NEGATIVE sign will mean the SAME irrespective of it at numerator or denominator..
D has -1 as power, so we will have reciprocal of the fraction \(\frac{-0.7}{0.012}\)

So ALL choices are negative and with same numerator 0.7..
So let's concentrate on denominator only..

LOWER the denominator, HIGHER the value of fraction if positive and LOWER the value of fraction if NEGATIVE.

0.000012 is the lowest value making \(\frac{-0.7}{0.000012}\) the least

A
_________________

1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html


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Re: Of the following, which is least?  [#permalink]

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New post 11 Dec 2017, 23:25
chetan2u wrote:
Bunuel wrote:
Of the following, which is least?

A. \(\frac{-0.7}{0.000012}\)

B. \(\frac{0.7}{-0.00012}\)

C. \(-\frac{0.7}{0.0012}\)

D. \((\frac{0.012}{-0.7})^{(-1)}\)

E. \(-\frac{0.7}{0.12}\)



A NEGATIVE sign will mean the SAME irrespective of it at numerator or denominator..
D has two NEGATIVE signs making it POSITIVE.... Eliminate.

Remaining choices are negative and with same numerator 0.7..
So let's concentrate on denominator only..

LOWER the denominator, HIGHER the value of fraction if positive and LOWER the value of fraction if NEGATIVE.

0.000012 is the lowest value making \(\frac{-0.7}{0.000012}\) the least

A


D is \((\frac{0.012}{-0.7})\) to the power of -1. Does it look like a multiplication? I'll try to edit somehow if it does.
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

Math Expert
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Joined: 02 Aug 2009
Posts: 6561
Re: Of the following, which is least?  [#permalink]

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New post 11 Dec 2017, 23:38
Bunuel wrote:
chetan2u wrote:
Bunuel wrote:
Of the following, which is least?

A. \(\frac{-0.7}{0.000012}\)

B. \(\frac{0.7}{-0.00012}\)

C. \(-\frac{0.7}{0.0012}\)

D. \((\frac{0.012}{-0.7})^{(-1)}\)

E. \(-\frac{0.7}{0.12}\)



A NEGATIVE sign will mean the SAME irrespective of it at numerator or denominator..
D has two NEGATIVE signs making it POSITIVE.... Eliminate.

Remaining choices are negative and with same numerator 0.7..
So let's concentrate on denominator only..

LOWER the denominator, HIGHER the value of fraction if positive and LOWER the value of fraction if NEGATIVE.

0.000012 is the lowest value making \(\frac{-0.7}{0.000012}\) the least

A


D is \((\frac{0.012}{-0.7})\) to the power of -1. Does it look like a multiplication? I'll try to edit somehow if it does.



Actually -1 is at the level of numerator and seemed to be in the same line, so misread it. Thanks
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1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html


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Re: Of the following, which is least?  [#permalink]

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New post 11 Dec 2017, 23:39
Numerator of all choices is 0.7.
Compare denominators: 0.12>0.012>0.0012>0.00012>0.000012.
Combine: the higher denominator, the lower fraction: 0.7/0.12 < 0.7/0.012 <0.7/0.0012 <0.7/0.00012 <0.7/0.000012
Add negative sign makes largest become least. So answer is A.
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Re: Of the following, which is least?  [#permalink]

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New post 12 Dec 2017, 03:19
When a positive number is divided by a number between 0 and 1 the result (quotient) gets bigger, the smaller the divisor, the bigger the quotient.

When a negative number is divided by a number between 0 and 1 the result gets smaller (moves to the left on the number line), the smaller the divisor, the smaller the quotient

in A divisor is the smallest among the denominators. Therefore the result of A will be furthest to the left on the number line

hope it helps
Re: Of the following, which is least? &nbs [#permalink] 12 Dec 2017, 03:19
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